Кофеин — разлика између измена

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* {{Cite book| ref=harv|last=Campo|first=Juan Eduardo|title=Encyclopedia of Islam |url=http://books.google.com/books?id=OZbyz_Hr-eIC&pg=PA154 |year=2009|publisher=Infobase Publishing |isbn=978-1-4381-2696-8 |page=154}}

* {{Cite book| ref=harv|last=Brown|first=Daniel W. |title=A New Introduction to Islam |datum=24.8.2011 |publisher=John Wiley & Sons |isbn=978-1-4443-5772-1 |page=149}}